Hello: Building ufraw --with-exiv2 as opposed to --with-libexif allows saving of exif data with the resulting output, at least when used as a gimp plugin. Needless to say, it's very useful, since right now all generated .jpg files end up lacking any exif data. (Note: Version 0.10 is out, too)
ufraw-0.11-3 uses both libexif and libexiv2.